The $200 Covered-Call Premium Can Become Part of a $6,700 Gross Capital Gain

The $200 Covered-Call Premium Can Become Part of a $6,700 Gross Capital Gain

An Australian investor owns 100 shares bought for an assumed adjusted cost base of $40 each. The shares now trade at $100. The investor writes one $105 call for $2 a share and describes the $200 premium as income.

If the call is exercised, the shares sell for $10,500 and the investor retains the $200 option payment. Under the simplified capital-account assumptions in this example, current Australian law includes that option payment in the capital proceeds from the share disposal. Capital proceeds are $10,700 against the assumed $4,000 adjusted cost base. The gross capital gain before costs, losses, discounts and tax is $6,700.

The premium is only 3% of that gross gain. Treating the trade as a $200 income decision would miss the larger event it can set in motion.

Before comparing call strikes, inspect the share parcel. Its adjusted cost base, acquisition date, unrealised gain and acceptable sale price can matter more than the premium ranking.

The option sits on an existing share gain

A covered call combines owned shares with a written call over an equivalent quantity. The investor receives premium and accepts an obligation to sell the shares at the strike if assigned. The ASX covered-call module says the writer must accept that the shares may be sold and that profit potential is limited if they rally.

The $200 premium resembles a reservation fee on a parcel of shares. If the buyer uses the reservation, the parcel leaves at the agreed price and the fee travels into the sale record. The small payment cannot be evaluated apart from the much larger asset.

In this example, the shares already contain a $6,000 unrealised difference between their $10,000 market value and assumed $4,000 adjusted cost base. The option does not create that appreciation. Assignment can turn it into a disposal.

The Options Industry Council's covered-call guide makes prior unrealised stock gains part of the strategy result. It also identifies assignment as central to the trade, caps much of the upside above the strike and leaves substantial stock downside.

Three expiration outcomes

Assume the investor holds the position to expiration, retains the $200 premium and is assigned when the shares finish at $120. The table measures economic value against the shares' $10,000 market value when the call was written. It does not calculate tax payable.

At $60, the premium absorbs $200 of a $4,000 share-price decline. The investor still owns the shares, and the simplified gross economic value remains $2,200 above the assumed $4,000 adjusted cost base. No share disposal occurs in this model, although the expired option still requires its own tax records.

At $100, the option expires under the stated assumption. The investor keeps the shares and premium. The $6,000 unrealised difference in the shares remains.

At $120, the investor receives $10,500 for the shares plus the $200 option payment. Holding the shares without the call would produce a $12,000 market value. The covered position therefore surrenders $1,300 of upside in this expiration comparison.

Premium income has not removed stock risk. It has exchanged some future upside for current cash and a contingent sale price.

Australian law joins the option and disposal records

The current Income Tax Assessment Act 1997, compilation dated 1 July 2026, sets out the capital-gains treatment used for this educational model.

Section 104-40 says CGT event D2 happens when an option is granted. Subsection 104-40(5) says a capital gain or capital loss from granting the option is disregarded if the option is exercised. Section 116-65 then says the capital proceeds from creating or disposing of the asset include any payment received for granting, renewing or extending that option.

That is why the assigned example uses:

$10,500 strike proceeds + $200 option payment = $10,700 capital proceeds

$10,700 capital proceeds - $4,000 assumed adjusted cost base = $6,700 gross capital gain

The calculation stops there. It does not estimate a net capital gain, taxable income or tax bill. Brokerage and other eligible cost-base items can change the adjusted cost base. Capital losses, ownership period, available discounts, entity type, residence and other circumstances can change the amount eventually included in a return.

Different treatment can also apply when shares or options sit on revenue account, form part of a trading business or fall under another tax regime. The Australian Taxation Office's CGT overview explains that disposing of shares can trigger a CGT event and that capital gains and losses feed into the income-tax calculation. A registered tax adviser should confirm the treatment of the actual parcel and option activity.

A direct sale sets a cleaner timetable

Selling the 100 shares now at $100 would produce $10,000 before costs. Against the same assumed adjusted cost base, the simplified gross capital gain would be $6,000.

The covered call postpones the disposal decision while leaving three possible paths. The shares may fall and remain in the account. They may finish below $105 and remain in the account after the premium is earned. They may be assigned at $105 before or at expiration.

That uncertainty can fit an investor who is prepared to keep the shares at lower prices and sell them at $105. It conflicts with a fixed plan to dispose of the parcel by a particular date.

Assignment can arrive before expiration. OMP's exercise and assignment guide explains the writer's delivery obligation, while the analysis of dividend-related early assignment shows why an in-the-money call can be exercised before the final day.

Buying back the call can cost more than the premium

Suppose the shares reach $120 at expiration and the investor now refuses to sell. The $105 call has $15 per share of intrinsic value. Buying it back at $15 would cost $1,500 before spreads and fees.

After subtracting the $200 originally received, the net option cost is $1,300. That matches the upside surrendered in the expiration comparison:

$12,000 uncovered share value - $10,700 covered-call value = $1,300

Before expiration, the call may also contain time value. A volatility increase can raise its repurchase price, and a wide market can add execution cost. OMP's liquidity guide explains why the displayed midpoint is not a promised fill.

Rolling does not erase the original obligation. It buys back one call and writes another, creating a new strike, date, premium and tax record. The old position still closes at the price available in the market.

Check the parcel before selecting the call

A pre-trade review can stay short and concrete.

1. Reconstruct the adjusted cost base. Identify the exact 100-share parcel, purchase records, brokerage and any later adjustments. The ATO's Guide to capital gains tax 2025 covers cost-base and recordkeeping obligations. A broker's average price display may not settle the tax calculation.
2. Calculate capital proceeds at assignment. For this capital-account model, add the strike proceeds and option payment, then compare that amount with the adjusted cost base.
3. Review the possible timing. Check the acquisition date, option expiration, dividend calendar, tax year and early-assignment exposure. Obtain advice where the timing can alter a material tax result.
4. Accept the sale before writing. Treat the strike as a real disposal price. If assignment would be regretted, the premium does not repair the conflict.
5. Fund the alternatives. Estimate the cost of closing the call, the cash needed for tax and the portfolio destination for sale proceeds. Include spreads and fees.

OMP's covered-call guide and payoff guide provide the contract mechanics. The covered-call scanner can compare candidate strikes, premiums, breakevens and payoffs. It cannot reconstruct a share parcel's adjusted cost base, determine tax treatment or decide whether assignment suits the owner.

When covered calls may fit

A covered call may fit an investor who has verified the parcel, can keep bearing the stock's full downside, welcomes a sale at the strike and has a plan for the cash if assigned. The trade can set a contingent exit price while collecting payment for the obligation.

The approach can also fit a gradual reduction plan when standard contract size matches the quantity the investor genuinely wants to sell. OMP's earlier employer-stock analysis explains why a call should cover only shares that already pass the household's concentration test.

When options may be unsuitable

Covered calls may be unsuitable when the investor must retain the shares, needs a certain sale date, cannot tolerate a large share-price decline or would chase a rally by repurchasing an expensive call. They may also be unsuitable when the parcel records are incomplete, the tax result could create an unfunded cash need, the option market is illiquid, or the investor cannot monitor early-assignment and corporate-action risk.

An investor facing a required sale may find a direct share order more aligned with the objective. An investor who wants downside protection needs a strategy with an actual floor; a covered-call premium supplies only a limited cushion.

Options Matrix Pro is a commercial options-analysis and decision-support platform founded by the author. It can compare listed contracts and display payoff information. It cannot provide personal financial or tax advice, identify the correct tax lot, calculate a tax return or determine strategy suitability.

The decision rule

Do not write the call until the covered parcel has a verified adjusted cost base and assignment at the strike remains acceptable after costs, tax review and portfolio consequences.

When the latent gain or repurchase cost is large beside the premium, let the parcel decide whether the option reaches the shortlist. A premium ranking cannot rescue a sale that the owner is unwilling or unprepared to complete.

Sources and methodology

This article was researched and updated on 3 August 2026. All prices, dates, parcels and outcomes are hypothetical. The tax illustration assumes an Australian investor holds the shares and exchange-traded option on capital account, owns 100 shares with an adjusted cost base of $4,000, writes one $105 call for $200 when the shares trade at $100 and is assigned in the $120 expiration case.

The model excludes dividends, commissions, bid-ask costs, interest, corporate actions, early assignment, option contract adjustments and tax. It does not apply capital losses, a CGT discount or an income-tax rate. The $6,700 figure is a simplified gross capital gain before those items, not a net capital gain or tax estimate.

• Federal Register of Legislation: Income Tax Assessment Act 1997, compilation dated 1 July 2026
• Australian Taxation Office: What is capital gains tax?, updated 22 June 2025
• Australian Taxation Office: Guide to capital gains tax 2025, published 28 May 2025
• ASX: Earn income from your shares
• ASX: Options contract specifications
• Options Industry Council: Covered Call (Buy/Write)
• OCC: Characteristics and Risks of Standardized Options

General education only. Options involve risk and are not suitable for all investors. This article does not consider any reader's objectives, financial situation or needs and does not provide personal financial, investment, legal, accounting or tax advice.